中心咬合位最大力噛みしめにおける咬筋, 側頭筋の協調性と制御能

抄録

The control ability which changes the coordination pattern of masticatory muscles in the Maximal voluntary clenching was investigated in the correlativity, using the electromyogram and the Dental-Prescale system on ten normal subjects.
Even the insignificant correlative Activity index to the balancing point of occlusal force was shown, though the anteroposterior control index (C_A/P) marked slightly correlative to the deviation of balancing point, when the coordination pattern of the masticatory muscles was controled in conscious. Asymmetry index also marked insignificant correlation to the balancing point of occlusal force, but lateral control index (C_Lat) was significantly coorelated under conscious deviation of balancing point.
Conclusions were as follows:
1. The balancing point of occlusal force was located at maxillo first molar anteroposteriorly and near the median line lateraly.
2. The coordination pattern consisted of nearly equal electromyographic activities during maximal clenching in the masseter and tempolaris anterior muscles in present subjects without the third molar.
3. The diagnosing in coordination pattern of masticatory muscles only using prescale system is difficult. But this system is reliable to estimate the control ability of the muscle coordination pattern.
From these result, one of the suggestion in central mechanism of masticatory muscles were undertaken in program of the central nurve system.